The first movie in the Washio Sumi no Shou trilogy.

Hitotose Chitose was always alone and untrusting of people but when 5 female teachers appear and started living together with him in his family's house as his mothers, things started to change and pick up, together with Hazuki-nee and Minazuki (his 2 sisters) everyday is a lesson. (Source: ANN)

Tsuki ni Naku will take the story content from volume 11 of the manga, which features a visit to a onsen by the members of the Hiizumi Life Councelling Office, while the town's police force have to deal with a new youkai-hunter threat. This OVA is bundled with the limited edition of the manga (14th, 15th, and 16th).

When the gods would not answer in humanity's desperate hour of need, it turned to a demon instead. The supposed savior came wielding the sword Zsoltgewinn, but its uncontrollable lust for blood led it to kill those who summoned it too. Although the sword was sealed away long ago, it has been uncovered by the Shoshidai, an organization that collects such cursed artifacts. However, Zsoltgewinn proves to be too strong to be tamed by humans when its corruptive power influences the administrator, Takuma Miura, to flee with it in his grasp. At the same time, Gai Ogata's family is torn apart due to the possession of another demonic sword, Shiryu, leading his father to be murdered and his mother to hang herself shortly after giving birth to him. Abandoned in the forest clutching the blade, he is discovered by the blacksmith Amon. Unnaturally transfixed by the sword, Gai works tirelessly for years to hone his smithing skills. However, when an accident costs him his arm, he gains a new one—in the form of a reforged Shiryu. Now having a cursed sword for an arm, Gai must learn to control its violent urges. All the while, Zsoltgewinn continues its rampage, leaving a path of blood in its wake.